干旱区生态环境知识资源中心(Arid): The deep electrical structure and seismogenic background of Lenglongling uplift and its adjacent areas in the eastern end of Qilian Mountains

Arid

DOI	10.6038/cjg2020N0257
	The deep electrical structure and seismogenic background of Lenglongling uplift and its adjacent areas in the eastern end of Qilian Mountains
	Zhao LingQiang 1,2; Zhan Yan 1; Wang QingLiang 2; Sun XiangYu 1; Hao Ming 2; Zhu YiQing 2; Han Jing 1
通讯作者	Zhan Yan
来源期刊	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
ISSN	0001-5733
出版年	2020
卷号	63 期号:3 页码:1014-1025
英文摘要	The Lenglongling uplift and its adjacent areas in the eastern end of Qilian Mountains are the areas where the northeastern margin of the Tibetan Plateau and the Alxa Block (ALB) are strongly squeezed and collided with each other. Historic earthquakes in this area are extremely strong. In order to reveal the deep extension of faults near Lenglongling uplift and the dynamic background of strong earthquakes in this area, on the basis of the existing magnetotelluric profiles, we have made intensive measurements of the areas near the Lenglongling uplift and the desert-covered areas on its northern side and extended the profiles southward. A magnetotelluric profile (LJS-N) with the length of about 460 km across the West Qinling Block (WQL), Longxi Basin (LXB), Lenglongling uplift of Qilian Mountains and ALB from southwest to northeast has been formed. In this paper, three-dimensional magnetotelluric inversion imaging of LJS-N and DKLB-M (about 80 km west of the LJS-N) profiles are studied. The results of two profiles reveal that the Qilian-West Haiyuan fault (QHF) zone is a large vertical super crustal electrical boundary zone with a slight tilt to the southwest, which is the most important boundary fault in Lenglongling uplift area. The deep electrical structure of the blocks on the northeast and southwest sides of the fault zone presents different resistivity distribution characteristics. The Southern Qilian Block (SQL), LXB and WQL on the southwest side of the fault zone show three-layer resistivity distribution characteristics of high-low-middle high. The Gulang Nappe Transition (GLT) on the northeast side is characterized by a relatively complete high resistivity structure with deep southwest and shallow northeast snuff bottles, while the three-layer resistivity distribution characteristics of high-low-sub-high level is presented from north to ALB. The earthquake source of the 1927 M8. 0 Gulang, 1954 M7. 0 Minqin and 2016 M6. 4 Menyuan earthquakes are all in a unified high resistivity structure GLT. Controlled by NE-trending compression of the Tibetan Plateau, the QHF, Northern Qilian fault (NQLF) and the Hongyashan-Sidaoshan fault (SHF) in the Lenglongling uplift area in the eastern end of the Qilian Mountains extend to the ALB in an imbricate NNE-trending sequence, which is the dynamic source of moderately strong earthquakes in the area.
英文关键词	Lenglongling uplift Qilian-West Haiyuan fault (QHF) Hongyashan-Sidaoshan fault (SHF) Three-dimensional magnetotelluric inversion Deep seismogenic background
类型	Article
语种	中文
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000519847700018
WOS关键词	NORTHEASTERN TIBETAN PLATEAU ; RESISTIVITY STRUCTURE ; VELOCITY STRUCTURE ; ROBUST ESTIMATION ; STRUCTURE BENEATH ; LATE QUATERNARY ; HEXI CORRIDOR ; CRUSTAL ; NORTHERN ; EARTHQUAKE
WOS类目	Geochemistry & Geophysics
WOS研究方向	Geochemistry & Geophysics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/314258
作者单位	1.China Earthquake Adm, State Key Lab Earthquake Dynam, Inst Geol, Beijing 100029, Peoples R China; 2.China Earthquake Adm, Monitoring & Applicat Ctr 2, Xian 710043, Peoples R China
推荐引用方式 GB/T 7714	Zhao LingQiang,Zhan Yan,Wang QingLiang,et al. The deep electrical structure and seismogenic background of Lenglongling uplift and its adjacent areas in the eastern end of Qilian Mountains[J],2020,63(3):1014-1025.
APA	Zhao LingQiang.,Zhan Yan.,Wang QingLiang.,Sun XiangYu.,Hao Ming.,...&Han Jing.(2020).The deep electrical structure and seismogenic background of Lenglongling uplift and its adjacent areas in the eastern end of Qilian Mountains.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,63(3),1014-1025.
MLA	Zhao LingQiang,et al."The deep electrical structure and seismogenic background of Lenglongling uplift and its adjacent areas in the eastern end of Qilian Mountains".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 63.3(2020):1014-1025.